Watts per square metre kelvin to BTU per hour square foot °F
1 watt per square metre kelvin = 0.17611 BTU per hour square foot °F · 1 BTU/(h·ft²·°F) = 5.6783 W/(m²·K)
1 watt per square metre kelvin = 0.17611 BTU per hour square foot °F
How it’s calculated
BTU/(h·ft²·°F) = W/(m²·K) × 0.1761101837
- Multiply the value in watts per square metre kelvin by 0.1761101837.
- To go back, divide by 0.1761101837 (or multiply by 5.678263341).
- 1 W/(m²·K) = 0.1761101837 BTU/(h·ft²·°F) · 1 BTU/(h·ft²·°F) = 5.678263341 W/(m²·K)
Show worked solutionFactor, unit cancellation and rounding, step by step
Find the conversion factor
By definition 1 BTU/(h·ft²·°F) = 5.67826334111349 W/(m²·K). Source: BIPM SI Brochure (9th ed.); NIST SP 811 / Handbook 44.
Multiply by the factor written as a fraction
Put W/(m²·K) in the denominator so it cancels, leaving BTU/(h·ft²·°F).
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 0.17611 BTU/(h·ft²·°F)
1 W/(m²·K) in other units
Batch convert W/(m²·K) → BTU/(h·ft²·°F)
- 1 W/(m²·K) = 0.17611 BTU/(h·ft²·°F)
- 5 W/(m²·K) = 0.88055 BTU/(h·ft²·°F)
- 10 W/(m²·K) = 1.7611 BTU/(h·ft²·°F)
- 25 W/(m²·K) = 4.4028 BTU/(h·ft²·°F)
Quick examples
- 1 watt per square metre kelvin = 0.17611 BTU per hour square foot °F
- 5 watts per square metre kelvin = 0.88055 BTU per hour square foot °F
- 10 watts per square metre kelvin = 1.7611 BTU per hour square foot °F
- 25 watts per square metre kelvin = 4.4028 BTU per hour square foot °F
- 100 watts per square metre kelvin = 17.611 BTU per hour square foot °F
About these units
Watt per square metre kelvin (W/(m²·K))
SI (metric)
SI unit of heat transfer coefficient and building U-value.
Base unit
Source: BIPM SI Brochure (9th ed.)
BTU per hour square foot °F (BTU/(h·ft²·°F))
US & imperial (identical)
IT BTU basis: ≈ 5.678 263 W/(m²·K). US U-factor unit.
1 BTU/(h·ft²·°F) = 5.678263341 W/(m²·K)
Source: NIST SP 811 / Handbook 44
Watts per square metre kelvin to BTU per hour square foot °F conversion table
| Watts per square metre kelvin (W/(m²·K)) | BTU per hour square foot °F (BTU/(h·ft²·°F)) |
|---|---|
| 0.1 W/(m²·K) | 0.017611 BTU/(h·ft²·°F) |
| 0.15 W/(m²·K) | 0.026417 BTU/(h·ft²·°F) |
| 0.2 W/(m²·K) | 0.035222 BTU/(h·ft²·°F) |
| 0.25 W/(m²·K) | 0.044028 BTU/(h·ft²·°F) |
| 0.3 W/(m²·K) | 0.052833 BTU/(h·ft²·°F) |
| 0.5 W/(m²·K) | 0.088055 BTU/(h·ft²·°F) |
| 1 W/(m²·K) | 0.17611 BTU/(h·ft²·°F) |
| 1.5 W/(m²·K) | 0.26417 BTU/(h·ft²·°F) |
| 2 W/(m²·K) | 0.35222 BTU/(h·ft²·°F) |
| 5 W/(m²·K) | 0.88055 BTU/(h·ft²·°F) |
| 10 W/(m²·K) | 1.7611 BTU/(h·ft²·°F) |
| 25 W/(m²·K) | 4.4028 BTU/(h·ft²·°F) |
| 50 W/(m²·K) | 8.8055 BTU/(h·ft²·°F) |
| 100 W/(m²·K) | 17.611 BTU/(h·ft²·°F) |
| 1,000 W/(m²·K) | 176.11 BTU/(h·ft²·°F) |
Related conversions
Frequently asked questions
How do I convert watts per square metre kelvin to BTU per hour square foot °F?
Use BTU/(h·ft²·°F) = W/(m²·K) × 0.1761101837. Multiply the value in watts per square metre kelvin by 0.1761101837.
How many BTU per hour square foot °F are in 1 watt per square metre kelvin?
1 watt per square metre kelvin (W/(m²·K)) equals 0.17611 BTU per hour square foot °F (BTU/(h·ft²·°F)); more precisely 0.1761101837.
How many watts per square metre kelvin are in 1 BTU per hour square foot °F?
1 BTU per hour square foot °F (BTU/(h·ft²·°F)) equals 5.6783 watts per square metre kelvin (W/(m²·K)); more precisely 5.678263341.
What is 10 W/(m²·K) in BTU/(h·ft²·°F)?
10 watts per square metre kelvin = 1.7611 BTU per hour square foot °F.
What is a watt per square metre kelvin?
SI unit of heat transfer coefficient and building U-value.
What is a BTU per hour square foot °F?
IT BTU basis: ≈ 5.678 263 W/(m²·K). US U-factor unit.
Formula: BTU/(h·ft²·°F) = W/(m²·K) × 0.1761101837. Factors last reviewed 2026-10-27.